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    Wyświetlanie 1-9 z 9
    Tytuł:
    Network Steganography in the DNS Protocol
    Autorzy:
    Drzymała, M.
    Szczypiorski, K.
    Urbański, M. Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/227099.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    DNS
    network steganography
    malware
    Opis:
    This paper presents possibility of using of the DNS (Domain Name System) protocol for creating a simplex communication channel between a malware-infected computer with a compromised DNS server. The proposed channel can be used to steal data or confidential enterprise information secretly.
    Źródło:
    International Journal of Electronics and Telecommunications; 2016, 62, 4; 343-346
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the impact of high temperature on the change in tensile strength of cement mortars with or without polypropylene fibres added
    Autorzy:
    Drzymala, T.
    Reszka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/30147052.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki
    Tematy:
    cement composites
    cement mortars
    tensile strength
    mechanical properties
    high temperature impact
    thermal spalling
    concrete
    reinforced concrete
    polypropylene fibre
    Opis:
    When evaluating concrete, its strength is the most important feature from the practical point of view. In compliance with technological requirements, the strength of concrete depends primarily on its composition, mainly on the content and strength of cement slurry. This is because this concrete component is most susceptible to changes in working conditions in a construction, including high temperature impact on concrete during the fire. The paper presents the results of tests performed on the cement mortar with and without the addition of polypropylene fibers. This treatment allowed for the elimination of the effect of the coarse aggregate by reason of the accuracy of the tested strength characteristics. The studies concerned the impact of high temperature on the change in tensile strength of cement mortars modified with the addition of polypropylene fibers. The analysis of available literature shows that one of the main causes of concrete’s thermal spalling is seen in high tensile stresses. The results of many tests prove that the addition of polypropylene fibers can have a positive effect on the behavior of concrete structures at high temperatures and help reduce spalling. The polypropylene fibers present in a composite may also positively influence the increase in tensile strength. This article discusses the purpose and scope of research, research methods, the experiment plan, test benches, and test results as well. The conclusions of the study were formulated in the final part of the article.
    Źródło:
    Scientific Journal of the Military University of Land Forces; 2018, 50, 3(189); 109-126
    2544-7122
    2545-0719
    Pojawia się w:
    Scientific Journal of the Military University of Land Forces
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zeta potential of Polish copper-bearing shale in the absence and presence of flotation frothers
    Autorzy:
    Peng, M.
    Ratajczak, T.
    Drzymała, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/89095.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
    Tematy:
    zeta potential
    frother
    flotation
    shale
    pH
    isoelectric point
    IEP
    empirical equation
    Opis:
    In this paper, zeta potential as a function of pH of copper-bearing shale, which is mined in Poland by KGHM, was investigated. The measurements were conducted in water and aqueous solutions of selected flotation frothers. It was established that for investigated copper-bearing shale, after dispersion in water, the isoelectric point (IEP) occurs at pH=3.5. Addition of frothers decreased the IEP on the pH scale and the IEP for butanol was 1.93, for MIBC 2.90 and for eicosaethylene glycol hexadecyl ether (C16E20) 2.76. In the case of introducing frothers changed, the zeta potential becomes less negative. An empirical equation, having two adjustable parameters, was used in the paper to approximate the course of the zeta potential-pH curve. The equation showed a very good approximation of the zeta potential of the investigated shale either in water or frother aqueous solutions.
    Źródło:
    Mining Science; 2014, 21; 57-63
    2300-9586
    2353-5423
    Pojawia się w:
    Mining Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flotation after a direct contact of flotation reagents with carbonate particles. Part 1, Model investigations
    Autorzy:
    Ahmed, H. A. M.
    Aljuhani, M. S.
    Drzymala, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/109753.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    phosphates
    flotation
    microemulsion
    separation Introduction
    Opis:
    Carbonate fluorapatite (francolite), calcite and dolomite separately, as well as their model mixtures, were subjected to flotation after conditioning the particles with microemulsion consisting of 20% of Custafloat AR27 (collector, blend of fatty acid soaps and sulfates), 55% fuel oil #5 and 25% water at 70% solids density and subsequent pulp dilution with water to 25% solids. The best separation of carbonate fluorapatite from calcite and dolomite occurred at pH 8.5 and microemulsion dose between 0.9 and 1.5 kg/Mg, 1.5 min conditioning time and 2 minutes of flotation time. The obtained flotation concentrates using 1.5 kg/Mg of collector contained 84% carbonate fluorapatite (34% P2O5) with 84% recovery. The 84/84 separation efficiency in terms of grade-recovery indices points to promising results which can be obtained for real phosphate ores.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2013, 49, 2; 713-723
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and surface energy of both fluorite halves after cleaving along selected crystallographic planes
    Autorzy:
    Janicki, M. J.
    Drzymala, J.
    Kowalczuk, P. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/110167.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    fluorite
    fluoride
    surface energy
    interfacial energy
    cleaving
    reorganization
    surface ions
    Opis:
    The density functional theory, supported with a commercial software, was used to compute the geometry and surface energy of fluorite cleaved along the (111), (110) and (100) planes. In the case of cleaving a piece of fluorite along the (111) plane the two newly created surfaces are identical consisting of fluorite ions with the surface energy equal to 0.384 J/m2. Cleaving fluorite along the (110) plane also provides identical halves and, both contain one Ca ion next to two F ions, with the surface energy equal to 0.723 J/m2. When cleaving takes place along the (100) plane, it creates two corresponding halves with different surface structures. One half, having only surface Ca ions (100Ca) has the surface energy equal to 0.866 J/m2, while the surface energy of the second half, having only F surface ions (100F), is 0.458 J/m2. Different structures and energies of the corresponding fluorite surfaces, that is (100Ca) and (100F) planes, should have an impact on their chemical properties, including hydrophobicity expressed by contact angle. The calculations performed in the paper also showed that reorganization of fluorite surfaces after cleaving was insignificant for all of the investigated planes.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 1; 451-458
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Durability of high performance concrete (HPC) subject to fire temperature impact
    Autorzy:
    Jackiewicz-Rek, W.
    Drzymała, T.
    Kuś, A.
    Tomaszewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/231408.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    trwałość
    beton wysokowartościowy
    warunki pożarowe
    fibrobeton
    beton napowietrzony
    durability
    high performance concrete
    fire conditions
    fibre reinforced concrete
    aerated concrete
    Opis:
    In the recent years a tendency for design of increasingly slender structures with the use of high performance concrete has been observed. Moreover, the use of high performance concrete in tunnel structures, subject to high loads with possibility of extreme loads occurrence such as fire, has an increasing significance. Presented studies aimed at improving high performance concrete properties in high temperature conditions (close to fire conditions) by aeration process, and determining high temperature impact on the concretes features related to their durability. In this paper it has been proven that it is possible to obtain high performance concretes resistant to high temperatures, and additionally that modification of the concrete mix with aerating additive does not result in deterioration of concrete properties when subject to water impact in various form.
    Źródło:
    Archives of Civil Engineering; 2016, 62, 4/II; 73-93
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Water contact angle on corresponding surfaces of freshly fractured fluorite, calcite and mica
    Autorzy:
    Kowalczuk, P. B.
    Akkaya, C.
    Ergun, M.
    Janicki, M.
    Sahbaz, O.
    Drzymala, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/110595.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    contact angle
    surface properties
    cleaving plane
    surface composition
    corresponding halves
    fluorite
    calcite
    mica
    Opis:
    Advancing and receding contact angles of water with corresponding surfaces of freshly fractured calcite, fluorite and mica were measured. The corresponding surfaces were obtained by mechanical splitting of a small lump of each mineral into two pieces. Theoretical considerations revealed that depending on the mineral cleaving plane, surfaces created by splitting into halves can be either identical or entirely different as far as their surface chemical composition is concerned. It was experimentally established that receding and advancing contact angles measured on the corresponding surfaces of fluorite, calcite and mica were identical for the sessile drop method. When the contact angle was measured by the captive bubble approach, there were small differences in the contact angles measured on the corresponding surfaces of fluorite. It was most probably due to surface irregularities and roughness, and therefore different times needed to rupture the liquid film between the bubble and solid surface.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2017, 53, 1; 192-201
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Light alloys for application as engine parts – comparison of properties of three materials
    Autorzy:
    Ranachowski, Z.
    Pawełek, A.
    Drzymała, P.
    Bonarski, J.
    Lewandowski, M.
    Ozgowicz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/360032.pdf
    Data publikacji:
    2014
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    hcp metals
    aluminium and magnesium alloys
    plastic deformation
    mechanical twinning
    crystallographic texture
    acoustic emission
    Opis:
    This paper discusses the mechanical properties, microstructure and crystallographic texture of light alloys made on the base of aluminium, magnesium and lithium. An acoustic emission (AE) technique was applied to detect the moment of twinning or slip activation during compression and channel – die tests to extend the comprehension on the nature of the plastic deformation processes occurring in the investigated alloys.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2014, 39 (111); 128-132
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evolution of Microstructure in Rolled Mg-Based Alloy. Textural Aspect
    Ewolucja mikrostruktury w walcowanym stopie na bazie Mg. Aspekt teksturowy
    Autorzy:
    Drzymała, P.
    Kania, B.
    Wróbel, M.
    Darłak, P.
    Długosz, P.
    Kwaśniewski, P.
    Bonarski, J. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/354309.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    magnesium alloy
    plastic deformation
    pilger rolling
    mechanical twinning
    crystallographic texture
    stop magnezu
    odkształcenia plastyczne
    stop walcowany
    tekstura krystalograficzna
    Opis:
    Magnesium alloys are the lightest structural materials, which makes them particularly suitable for use in the aircraft and automotive industry. However, due to hexagonal close-packed crystal structure, resulting in insufficient number of independent slip systems, magnesium alloys exhibit poor formability at room temperature. Conventional methods of work hardening of magnesium alloys requires the temperature about 300°C, which favours simultaneously processes of thermal recovery and grain growth, but decreases beneficial microstructure strengthening effect. Thus, it is a crucial to undertake development of a technology for semi-finished magnesium alloys elements, which will ensure better mechanical properties of the final products by forming desirable microstructure. In the paper we present the development of crystallographic texture of the Mg-based alloy (Mg-AZ31) in the form of pipe extruded at 430°C and subjected to pilger rolling at relatively low temperature.
    Stopy magnezu należą do najlżejszych materiałów konstrukcyjnych, co czyni je szczególnie użytecznymi w przemyśle lotniczym i samochodowym. Jednakże ze względu na strukturę heksagonalną zwartą, skutkującą niewystarczającą liczbą systemów poślizgu, stopy magnezu wykazują złą plastyczność w temperaturze pokojowej. Konwencjonalne metody umocnienia poprzez zgniot wymagają temperatury około 300°C dla tych stopów, co sprzyja jednocześnie procesom zdrowienia i rozrostu ziarna, ale obniża sam efekt umocnienia. Zatem kluczowe jest rozwinięcie technologii dla półproduktów ze stopu magnezu, która zapewni lepsze właściwości mechaniczne końcowych produktów poprzez uformowanie korzystnej mikrostruktury. W pracy przedstawiono rozwój tekstury krystalograficznej stopu na bazie magnezu (Mg-AZ31) w formie rury wyciśniętej w temperaturze 430°C i poddanej walcowaniu pielgrzymowemu we względnie niskiej temperaturze.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 4; 2505-2512
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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